# button setup (connect to GND and board Pin 21)
import RPi.GPIO as GPIO # GPIO pins
#import time


def print_button():

    GPIO.setmode(GPIO.BOARD) #Use the physical board number (not GPIO numbering)
    GPIO.setup(21, GPIO.IN, pull_up_down=GPIO.PUD_UP) #Change pin if necessary #print button
    GPIO.setwarnings(False) #Ignore warnings

    print_button_pressed = False

    if GPIO.input(21) == GPIO.LOW:
        #time.sleep(1)
        print_button_pressed = True
        GPIO.cleanup() #GPIO clean up

    return print_button_pressed